This book was in print for a long time. There were editions in
1934 and 1938. The 4th printing of the second edition, which is
what I own, came out in 1951. For the flags and seals the author
states that the contents of the book simply reports the laws
concerning the flag. Inspection shows that this results in uneven
coverage, from the 5 lines on the flag of Kentucky to the 7 pages
on the flag of Texas filled with detailed regulations on what one
could do with the Texan flag. A most useful resource if
you’re looking for the pre-1940 legislative history of a
state flag.John Radel, 21 Oct 1995